docs: def a(self, text, count=1):
          """
          Return the appropriate indefinite article followed by text.
  
          The indefinite article is either 'a' or 'an'.
  
          If count is not one, then return count followed by text
          instead of 'a' or 'an'.
  
          Whitespace at the start and end is preserved.
  
          """
          mo = re.search(r"\A(\s*)(?:an?\s+)?(.+?)(\s*)\Z", text, re.IGNORECASE)
          if mo:
              word = mo.group(2)
              if not word:
                  return text
              pre = mo.group(1)
              post = mo.group(3)
              result = self._indef_article(word, count)
              return "{}{}{}".format(pre, result, post)
          return ""